IV.] LOTUS. 3 7 irregular corolla are fertilised by insects. The advan¬ tage of the irregularity is that it compels the insects to visit the nectary in one particular manner. In the present group the result is that insects necessarily alight on a particular part of the flower, when their weight in… … another. The corolla in the Leguminosae consists of five petals ; an upper one, usually called the “ Stan¬ dard,” two lateral ones, or “Wings;” and two lower ones, united at their edges into a boat-shaped organ, or “ keel.” The bases of the stamens coalesce into a hollow tube (Fig. 70 and 71 t) the…
Flowers -- Color · Plants -- Variation · Fertilization of plants
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